Invisible cuff tacker attachment



Sept. 18, 1956 w. E. MENscHlNG 2,763,225

INVISIBLE CUEE TICKER ATTACHMENT Filed July 21, 195s Fig. 2

Wal/er E Mensch/hg 1N VEN TOR.

WWW, H

United States Patenti() INVISIBLE CUFF TA'CK'ER ATTACHMENT Walter E.Mensching, Milwaukee, Wis. Application July 21, 1953, Serial No. 369,3884 Claims. (Cl. 112-178) This invention relates in general toimprovements in sewing machines, and more specifically to an invisiblecuff tacker attachment.

The primary object of this invention is to provide an improved invisiblecuff tacker attachment for blind-stitch sewing machines of the ltypedisclosed in Patent No. 2,250,745, issued July 29, 1941, said attachmentpermitting the rendering of a feed dog on such a sewing machineinoperative whereby cuffs and the like may be tacked with such a sewingmachine.

Another object of this invention is to provide an improved invisibleculf tacker attachment which may be` conveniently attached to blindstitch sewing machines whereby the feed mechanism of the sewing machinemay be selectively rendered operative or inoperative.l

Another object of this invention is to provide an improved invisibleculf tacker attachment for a blind stitch sewing machine which is of arelatively simple construction and of a design whereby the same may bequickly and easily attached to existing blind stitch. sewing machineswith a minimum of modcation to such machine.

A further object of this invention is to providean improved adjustablespring connector, the spring connector being of a type whereby thespring may be selectively positioned in one of two positions, wherebythe tension thereon may be selectively carried.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure 1 is a vertical sectional view taken through a conventional blindstitch sewing machine and showsisuch,

a machine provided with the invisible cuff tacker attachment which isthe subject of this invention and alternate position of the attachmentbeing shown in dotted lines;

Figure 2 is a fragmentary vertical sectional view taken substantiallyupon the plane indicated by the section line 2 2 of Figure 1 and showsthe general shape of a mounting plate of the attachment; and v Figure 3is a perspective exploded view of adjustable spring connector means ofthe attachment.

Referring now to the drawings in detail, it will be seen that there isillustrated in Figure l a conventional blind stitch sewing machine ofthe type disclosed in Patent No. 2,250,745. The blind stitch sewingmachine includes a plate 10, which has associated therewith a curvedneedle 12. Underlying the plate is a pair of spaced turnable lingers 14which are pivotally mounted as at 16. The turnable fingers 14 areintended to support portions of a garrnet 18 being stitched and areassociated with a feed dog 20 for feeding lthe garment 18 beneath theneedle 12.

In order that the left side of each of the turnable lingers 14 may beretained in the proper position, there is pivotally mounted as at 22 arear body member 24 which has a transverse pin 26 on which there ispivotally mounted a rib member 27. The rib member 27 is connected to anarm 28 of ythe rib body spring 30.

The sewing machine also includes an arm 32 which Iis pivotally mountedas at 34. The arm 32 includes a ,finger 36 which underlies the rightside portion of each of the turnable fingers 14 to urge the same towardthe feed dog 20. Thearm 32 alsoincludes a lower extension 38 which isnormally spring urged to the right by a tension spring 40 which isconnected to a work table 42. It will be understood that the springs 30and 40 retain the turnable fingers 14 in the proper relation withrespect to the plate 10 and the feed dog 20 so that the garment 18 beingsewed by the needle 12 will be fed through the work area of the sewingmachine at the proper rate.

The sewing machine illustrated in Figure 1 also includes other featuresnecessary in the operation thereof, but playing no part in the presentinvention. Inasmuch member 24 by a 4as these features are clearlyillustrated and described in i Patent No. 2,250,745, it is not believedthat further description thereof is necessary.

Inasmuch as the turnable lingers 14 are retained in associated relationwith the feed dog 20, it will be seen that any garment, such as thegarment 18 disposed therebetween will be automatically fed with respectto the needle 12. However, While this type of blind stitching is desiredin many cases, in the cases of cuffs on mens pants, and the like, it isdesired to place a plurality of stitches in one spot so as to be sure ofthe tacking and `at the same time limit the area of the stitching.Inasmuch as the feed Vdog 20 would automatically feed the garmentthrough the sewing machine, it will be seen that the sewing machine, asoriginally manufactured, would not be suitable for tacking of cuffs oftrousers and the like. t

`In order that the sewing machine of Figure l may be converted to` beselectively used as a blind stitch sewing machine or as an invisiblecuff tacker, there has been provided theinvisible culftacker attachmentwhich is the subject of this invention, the attachment being referred toin general by the reference numeral 50. The attachment 50 `includes agenerally rectangular mounting plate A 52, the mounting plate 52 isprovided adjacent its upper edge with a pair of apertures 54 throughwhich are rey ceived fasteners 56 which secure'the upper portion of themounting plate 52 to the work table 42. It will be understood that themounting plate 52 is secured to a surface of the work table 42 remotefrom the extension 38 of the arm 32.

The mounting plate 52 is provided adjacent its lower edge with a pair ofvertically extending rectangular openings 58. The openings 58 haveextending therethrough legs 60 of a U-shaped spring connector member 62.The

r spring connector member 62 also includes a bight portion 64 whichpasses through a cam member 66. The cam member 66 is provided with anactuating arm 68 to facilitate positioning thereof. Itwill also be notedthat the legs '60 are provided with enlarged hinge 70 to facilitateconnection thereof to a pair of springs 40.

Inasmuch as the bight portion 64 of the spring connector member 62 ispassed through the cam 66 eccentric of the center thereof, it will beseen that the effective length of the legs 60 of the spring connectormember 62 may be varied, as is best illustrated in Figure l. When thecam 66 is in the position best illustrated in forward lines in Figure 1,the tension of the spring 48 is to normal tension for the sewing machinein Figure 1 and the turnable fingers 14 will be positioned relative tothe feet of 20 in the normal manner and the sewing machine will Operateas originally designed. However, if the arms 68 of the cam 66 is swungto the dotted line position of Figure l the effective length of the leg60 will be increased Patented Sept. 18, 19545Y 3 with the result thatthey will move to their dotted line positions. This will reduce thetension on the springs 40 and permit the arm 32 to pivot about the pivot34 and permit downward movement of the turnable fingers 14.

When the turnable fingers 14,are in their lowermost. po?A positionedrelative to the feed dog 20, the extension 38 of the arm 32 is providedwith an adjustable stop member 72. The stop member 72 is positioned toengage a portion of the work table 42 and limit swinging ofthe extension38 tothe right. By adjusting the effective length of the stop member 72,the position of the turnable fingers 14 with respect-to the feed dogsmay be selectively varied.

From the foregoing, the construction and operation of the device will bereadily understood and further explanation is believed to beunnecessary. However, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction shown and described, andaccordingly all suitable modifications and equivalents may be resortedto, falling within the scope of the appended claims.

What is claimed as new is as follows:

1. Anattachment for a blind stitch sewing machine of the type havingturnable fingers associated with a feed4 dog and a control arm for saidfingers, said turnable fingers being urged into positionby a spring;said attachment comprising a mounting plate, an adjustable spring.

connector member, and a cam, said spring connector member being carriedby said cam and passing through said mounting plate, said spring beingterminally connected to said spring connector member, said cam engagingsaid mounting plate and positioning saidspring connector member relativethereto, said cam being movable to move said spring connector memberthrough said mounting plate to vary the effective length of said spring.

connector member relative to said mounting plate and selectively rendersaid spring inoperative.

2. An attachment for a blind stitch sewing machine of the type includinga turnable finger for supporting material being sewn, a feed dog forfeeding material over said turnable finger, a Work table underlying saidturnable finger, an arm mounted adjacent said work table, said armhaving the intermediate portion thereof carried by a pivot thereby saidarm pivots with respect to said work table, said arm having one endengaging said turnable finger to selectively retain said turnable fingerin cooperating relation with said feed dog, a spring, said ,springconnecting an opposite end of said arm to said Work table, said springthrough said arm spring urging said turnable finger into position withrespect to said feed dog; said attachment comprising a mounting platesecura-.

Inasmuch as the cuff' ble to said work table, a spring connector, and acam, said spring connector being carried by said cam for adjustmentrelative to said mounting plate, said cam being engaged with saidmountingplate and being movable to vary the effect of length of saidspring connector member relative to said mounting plate to selectivelyrender said spring inoperative whereby said arm permits said turnablefinger to move out of cooperating relation with said feed dog.

3. An attachment for a blind stitch sewing machine of the type includinga turnable linger for supporting material being sewn, a feed dog forfeeding material over said turnable finger, a work table underlying saidturnable finger, an arm mounted adjacent said work table, said armhaving the-intermediate portion thereof carried by a pivot thereby saidarm pivots with respect to said work table, said arm having one endengaging said turnable finger to selectively retain said turnable lingerin cooperating relation with said feed dog, a spring, saidspringconnecting an opposite end of said arm to said work table, saidspring through said arm spring urging said turnable finger into positionwith respect to said feedldog; said attachment comprising a mountingplate securable to said work table, a spring connector, and a cam,said-spring connector being carried by said cam for adjustment relativeto said mounting plate, said cam being engaged with said mounting plateand being movable to vary the effect of length of said spring connectormember relative to said mounting plate to selectively renderv saidspring inoperative whereby said arm permits said turnable finger to moveout of cooperating relation with,y said feed dog, adjustable stop meanscarried by said arm,and engaged with said work table to limit movementof said turnablel nger towards said feed dog.

4. An attachment for a blind stitch sewing machine of the typehayingturnable fingers, a feedA dog, said turnable fingersbeingassociated with said feed dog for positioning .cloth to be sewedrelative thereto, a pivotally mounted controlarm having one end engagedwith said finger, a spring, connected to the other end of saidcontrol-arm pivoting said control arm into engagementwith said turnablefingers to retain.said turnable fingers in cooperating relation withsaidfeed dog, said attachment including a mounting plate, an adjustablespring connector member for anchoring said spring remote from saidcontrol arm, alcam, said'spring connector member being U- shapedinoutlineand having spaced legs connected by a bight portion, said legsfreely passing through said mounting plate and havingl terminal endsconnected to said spring, said -cam rotatably carrying said bightportion and engaging-said mounting plate, said cam being movable toselectively vary the position of the terminal ends relativeto-saidfmounting plate whereby said spring may be selectively renderedinoperative.

References Cited in the file of this patent UNITED STATES PATENTS 52,932Rehfuss Feb. 27, 1866 2,161,527 Mueller June 6, 1939 2,658,464 GrecoNov. l0, 1953

